Row, row, row your boat,
Gently down the stream.
Merrily, merrily, merrily, merrily,
Life is but a dream.

This nanny-rhyme, also sung bu Spock, Kirk e McCoy in 'Star Trek V: The Final Frontier', is often used as representation for existential doubts about reality and choices that must be taken during the lifetime.

Its chorality reminds the effort of rowing and the need to work together to reach the destination.

Like in The Road Not Taken, its refers to the journey of each human being in the stream of life and to the free will to change it by choices.

It can be interpreted by a religious viewpoint or nihilist sentiment too.